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Hi Matthew, sorry to bother you again, but I was wondering if the B0 unwarping is a necessary step in a preprocessing pipeline. I am asking you this, because I never did it and I don't have a field map to put as input, but should I perform this step or is it required only in certain conditions? The information I have on my data are these: Data were acquired on a 3 Tesla Siemens Vereo MRI scanner with a 32-channel birdcage radio frequency headcoil (neckcoil was not used, leaving 28 channels). For the functional scans, a 28 slice axial prescription (5 mm thickness) gave whole brain coverage. For each imaging run, a series of 190 gradient echo echoplanar volumes were acquired over each: TE = 35 ms, TR = 2000 ms, Flip Angle =75O, NEX = 1, BW = 100.0, FOV = 24mm, matrix =128 x 128 (in-plane resolution of 1.875mm2). Thank you, Carlotta. ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1